A cuboid shaped wooden block has 6 cm length, 4 cm breadth and 1 cm height.<br />Two faces measuring 4 cm x 1 cm are coloured in black.<br />Two faces measuring 6 cm x 1 cm are coloured in red.<br />Two faces measuring 6 cm x 4 cm are coloured in green.<br />The block is divided into 6 equal cubes of side 1 cm (from 6 cm side), 4 equal cubes of side 1 cm(from 4 cm side). How many cubes will have green colour on two sides and rest of the four sides having no colour ?

There are 16 small cubes attached to the outer walls of the cuboid.Therefore remaining inner small cubes will be the cubes having two sides green coloured.So the required number = 24 - 16 = 8